Math

In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 9. Grades are to be assigned according to the following rule:

The top 10% receive A's.
The next 20% receive B's.
The middle 40% receive C's.
The next 20% received D's.
The bottom 10% receive F's

What is the least amount of points that a student must score, on the final exam, in order to earn a D? (Round your answer to two decimal places.)

67.32 is the answer

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  1. using same web site for normal dist
    A = .1
    M = 72
    sd = 9

    .1 area is anything below 60.46

    If I try bottom .3, anything below a C, I get
    A = .3 ---> below 67.28, that is the boundary for the HIGHEST D

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